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Re: 8924c memory loss
Better to say:
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Show quoted text
?And you almost can't send too many pictures, either contained in your post or uploaded to the files section.
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Re: 8924c memory loss
Gang, When replying to a post, please try to avoid automatically quoting (including) a lot, or all of the prior message.? ?Often you can just leave the old stuff out completely. With the AA battery issue, I just quoted two lines out of Ralph's fairly lengthy reply. This is not about saving bandwidth.? It's about keeping the replies shipshape and free of needless repetition. It's also not about keeping your posts short.? I am a big proponent of long messages if they're needed.? You never need to do here on this Group.io what is seen too often -- the techie who apologizes for his long email.? ? And you almost can't send too many pictures, either inline or to the files section. Hank |
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Re: 8924c memory loss
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I'll look into the battery changing.? I hate things with batteries in them for long term usage.? About as bad as some things that use that Dallas clock chip that has to be changed about every 10 or so years.? It would not be so bad if there was an easy way to change them like the water filter on my refrigerator.? Just screw the cover off and put in another without having to remove the 'million' screws.
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Ralph
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On Saturday, December 11, 2021, 04:13:07 PM EST, Hank wrote:
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Put it on your to-do list to CHANGE those AA batteries pronto!? ?Whether that's your immediate problem or not.? ?On all three sets, too.
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When you do I pray you'll find not a spot of evil battery juice has oozed out.
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Re: 8924c memory loss
Put it on your to-do list to CHANGE those AA batteries pronto!? ?Whether that's your immediate problem or not.? ?On all three sets, too. When you do I pray you'll find not a spot of evil battery juice has oozed out. ____________________________________________________
On Saturday, December 11, 2021, 03:54:17 PM EST, Ralph? wrote:
Hank,? I did not know about changing batteries.? I have never changed any batteries in the sets. I actually have 3 of the sets.? The oldest I bought over 10 years ago.? |
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Re: 8924c memory loss
Hank,?
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I did not know about changing batteries.? I have never changed any batteries in the sets. I actually have 3 of the sets.? The oldest I bought over 10 years ago.? It was only opened by me 2 times.? That was to change the input attenuator from 3 watts to a 60 watt unit and the? power supply quit so it was repaired.? It still works and the clock keeps time but it is left plugged in most of the time but turned off and may be a month before it is turned on.??
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I bought 2 off ebay for about $ 600 .? One was suppose to work and the other was for parts.? The working one was fine and the parts unit had a broken knob that I repaired but no power supply.? When I opened the working one up to change the input attenuator I took the power supply out and put it in to the parts unit.? That unit powered up and seemed to work .? Later I found an inexpensive power supply for it.??
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Both? of the other 2 units have been unplugged for? a few months.? One comes up fine.? The other comes up in the cell phone mode and the clock resets back to about 1980 and the time is way off.?
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I used a battery drill to remove the 'million' screws in it and put them back in with the tork setting at the lowest.
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I may have to install an over head crane to move them around.. Grin.? ?I have one on a Craftsman tool box and the other 2 on a table with rollers on it so I can move them around my basement.
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Ralph ku4pt
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On Saturday, December 11, 2021, 03:10:51 PM EST, Hank wrote:
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Have you ever changed the two AA cells since you've owned the instrument?? They should be changed I think every two years at most; the HP book may say even a little more frequently.?
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Re: 8924c memory loss
Ralph, I'm going to take a shot at this even though you have way more operating experience than I have. Have you ever changed the two AA cells since you've owned the instrument?? They should be changed I think every two years at most; the HP book may say even a little more frequently.? They are towards the back of my test set (not a 24C) and torx 15 screws must be removed to do this; they're in their own little battery holder case.? I think there are less than 500 to remove you'll be glad to know.? ?This is all illustrated and explained in your 24C book. This is one of two batteries (I think) that are inside, not counting cells that might be in the regular plug-in memory card.? Of course there are other things that could cause this symptom.? You might report to us if the clock is running, and if it looks to be running at full speed. This is kind of psychic because I was just reading a few hours ago about the necessity to do this in a recent upload to our files section.? I need to get a T15 screwdriver ASAP because I don't want to get into trouble with these complex test sets just by my own inattention to simple maintenance tasks analogous to changing the oil.? ?The local big box does have them and for sale one by one without having to buy a whole set (there is a God). Hank |
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8924c memory loss
What would cause a 8924c to loose the memory. That is I had it setup to come up in a FM service type mode by the command POWERON. Now it reverts back to the cell phone test screen. It has worked well for around 5 or so years before this. I did not use it for about 6 months and it lost the memory. I let it run for 24 hours and it still lost the power on setting after I had reinstalled it.
There must be a battery somewhere as it does seem to have a clock function in the setup screen. If so what module is the battery in ? Ralph ku4pt |
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Re: Spectrum Analyzer Trace Too High
There are several things that will cause that if the settings are wrong. 1.? You have the tracking generator turned on 2.? ?The tracking generator is set too high 3 The RF in is selected instead of the ANT Ralph ku4pt
On Monday, December 6, 2021, 10:19:14 PM EST, lobos305 via groups.io <lobos305@...> wrote:
Not sure if I hit a setting but my trace is not settling at the bottom of the scope - it is about three-quarters of the way to the top.? The reference level is at -10db.? Is there something else I should be lookig at? Pat |
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File /HP 8935/E8935 EPSG087543.pdf uploaded
#file-notice
[email protected] Notification
The following files have been uploaded to the Files area of the [email protected] group. By: lobos305@... Description: |
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Re: 8935 Service Manual & Power Supply Rebuild
Hi Patrick ? You might find this article interesting ?by Agilent / HP 8935? E6380A????????Amtronix Instruments, Inc ? Also did find a service manual Part number E6380-90015 as apparently there is a family of them 8935 / E6380 / 6381 / 6382 But it was on a site that wanted to update me to windows ?10 ? Regards Paul _________________________________________________________________________?
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8935 Service Manual & Power Supply Rebuild
Hi all! Happy to have found this group. |
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Re: 8924c 60/100 watt upgrade kit
Yes - that was the kit I had used where you sent back the card, etc.? ?Ok well again I was just curious.? And yes, a screw gun would help big time with this work.
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Thanks so much for all of the info - Sig - KB2HHU...
On Friday, October 29, 2021, 03:10:53 PM EDT, Ralph Mowery wrote:
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It was over 10 years ago I bought the upgrade 60 watt? kit from ebay .? It had the attenuator, an emblem to paste over the BNC and a card to up load the info.? I had to send the card back for a $ 50 or so deposit.? I do not see that kit any more.
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Re: 8924c 60/100 watt upgrade kit
This was in the files.? All or almost all of the Yahoogroup files are here.? It's just a matter of finding them.? Ralph helped once again by giving me the file title. ?HP-8924C_100W_upgrade.pdf Hank |
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Re: 8924c 60/100 watt upgrade kit
It was over 10 years ago I bought the upgrade 60 watt? kit from ebay .? It had the attenuator, an emblem to paste over the BNC and a card to up load the info.? I had to send the card back for a $ 50 or so deposit.? I do not see that kit any more. I later bought a 20 db pad to put in another.? Someone had uploaded the files for a 20 db pad so I loaded that into the 2nd 8924c and all was well. The card changes some date somewhere in the 8924c, but I don't know where.? It is not the place in one of the setup screens where you can plug in your own offset. If you think there is only a zillion screws , you should be careful and not do what I did and drop one of the screws down into the module with the display tube.? That is another zillion. I used a battery drill and torx bit to remove most of the screws. Ralph ku4pt
On Friday, October 29, 2021, 01:59:43 PM EDT, Siegmund Souza via groups.io <zigs68@...> wrote:
Yes - I saw those pads on eBay and that was what I did with the one 8924c that was upgraded.? You got a pad where you removed the one that was there and soldered in the new one which had the higher attenuation and the heatsink was the same meaning you used the one you had.? There was a PCMCIA calibration card that came with it where you uploaded some data.? Unfortunately I do not know much about what was uploaded.? I guess knowing the attenuation you could just do the same offset in the settings and that is all?? ?Maybe that is what uploading that data from the card did.
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Checking the fit would be important with this indeed.? I do not see any files that show how to replace the pad but from what I recall it was not difficult other than removing a zillion screws (exaggeration somewhat - not too much) to get to the heatsink.? I do see in the files the use of an external attenuator and how to set that up.
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I was just curious if those kits on ebay still existed somewhere.? Probably most went the route of the external attenuator which is fine since its not like you are going to worry about the 8924C being "less portable" than it is having to connect the attenuator and cables to test.? It stays on the table or bench and that is it.
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Thanks - Sig - KB2HHU? ?.
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Re: 8924c 60/100 watt upgrade kit
Yes - I saw those pads on eBay and that was what I did with the one 8924c that was upgraded.? You got a pad where you removed the one that was there and soldered in the new one which had the higher attenuation and the heatsink was the same meaning you used the one you had.? There was a PCMCIA calibration card that came with it where you uploaded some data.? Unfortunately I do not know much about what was uploaded.? I guess knowing the attenuation you could just do the same offset in the settings and that is all?? ?Maybe that is what uploading that data from the card did.
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Checking the fit would be important with this indeed.? I do not see any files that show how to replace the pad but from what I recall it was not difficult other than removing a zillion screws (exaggeration somewhat - not too much) to get to the heatsink.? I do see in the files the use of an external attenuator and how to set that up.
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I was just curious if those kits on ebay still existed somewhere.? Probably most went the route of the external attenuator which is fine since its not like you are going to worry about the 8924C being "less portable" than it is having to connect the attenuator and cables to test.? It stays on the table or bench and that is it.
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Thanks - Sig - KB2HHU? ?.
On Friday, October 29, 2021, 01:09:49 PM EDT, Ralph wrote:
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There are some on ebay for about $ 30 .? This may not be the one you need, but similar.? You have to check the physical size to see if it will fit in.
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Re: 8924c 60/100 watt upgrade kit
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You really need an almost 20 db pad as the 3 watt version already has a 4 db pad that is removed.? I think the heat sink is the same for the 60 watt and the 3 watt versions, so all you need is the insert.? I have a file that shows how to do that if you do not see it in the file section here.
There are some on ebay for about $ 30 .? This may not be the one you need, but similar.? You have to check the physical size to see if it will fit in. ?
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On Friday, October 29, 2021, 01:01:48 PM EDT, Siegmund Souza via groups.io <zigs68@...> wrote:
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Thanks Ralph - that is an option and there were other posts that mention where to go to create the offset in the power.? You would need a 16 dB attenuator ideally to put the 100 watts down to 3 watts from what I calculated.? Attenuators for a 100 watt rating seem expensive though but maybe I am looking in the wrong places.
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Thanks again - Sig - KB2HHU
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Re: 8924c 60/100 watt upgrade kit
Thanks Ralph - that is an option and there were other posts that mention where to go to create the offset in the power.? You would need a 16 dB attenuator ideally to put the 100 watts down to 3 watts from what I calculated.? Atenuators for a 100 watt rating seem expensive though but maybe I am looking in the wrong places.
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Thanks again - Sig - KB2HHU
On Friday, October 29, 2021, 12:56:09 PM EDT, Ralph Mowery via groups.io <ku4pt@...> wrote:
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You may want to do like I did a few years back.? Just buy an attenuator from ebay of a 100 watt rating that will fit the heatsink that is already in the 8924C.? There were some files in the files section to download what you need to make it work or you can just use the offset built into one of the setup screens.
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Ralph ku4pt.
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Re: 8924c 60/100 watt upgrade kit
You may want to do like I did a few years back.? Just buy an attenuator from ebay of a 100 watt rating that will fit the heatsink that is already in the 8924C.? There were some files in the files section to download what you need to make it work or you can just use the offset built into one of the setup screens. Ralph ku4pt.
On Friday, October 29, 2021, 12:44:49 PM EDT, Siegmund Souza via groups.io <zigs68@...> wrote:
Just asking about availability of the 8924c upgrade kit.? I did install this kit to an 8924c a long time ago where the higher dB value attenuator "pad" inside\soldered to the heatsink was changed and I had a calibration card with instructions were I set up the 8924c to show the correct power values, etc.? Is Amtronix the only place that has these kits these days which I guess sells you the whole heatsink assembly with the correct attenuation?? There used to be listings on eBay but of course these units are very old and not as available as they were way back when.?
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Patrick W3AXL
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